| Registered Name | Owner / Club | Status |
|---|---|---|
| Aphrodite Orca Phoenix | Andrew Thornton Killegar | Approved |
| Apollo | Laura Doyle Mullingar | Approved |
| Apollo 13 | Rachel Gilheany Drumcoura | Approved |
| Apollos Wish | Lindsey Newitt Thomastown and District | Approved |
| Appolo Fifteen | Triona Dever Cheval | Approved |
| April Moonlight | Olivia Nolan Castle Hill | Approved |
| April Raven | Rachel Harney Mullingar | Approved |
| Aquilla | Jonah Wragg Unicorn | Approved |
| Ar Ais Aris | John McDaid Donegal Gaeltacht | Approved |
| Arabian Dynasty | Vikki Byrne Killcarrick | Approved |
| Arabian Light | Regina Fahy Tynagh | Approved |
| Arabougg (GB) | Vicky George Kilrainy | Approved |
| Araglen Bucks Fizz | Mary Carter Warrington | Approved |
| Araglen Hocus Pocus | Aoife Bolton Coole Lane | Approved |
| Araglen Leonardo's Quest | Mary Carter Warrington | Approved |